 /*******************************************************************************
  * Copyright (c) 2003, 2005 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.ui.internal;

 import org.eclipse.ui.IWorkbenchPage;
 import org.eclipse.ui.IWorkbenchPartReference;
 import org.eclipse.ui.IWorkbenchWindow;

 /**
  * Toggles the maximize/restore state of the active part, if there is one.
  */
 public class MaximizePartAction extends PageEventAction {

     /**
      * Creates a MaximizePartAction.
      *
      * @param window the window
      */
     public MaximizePartAction(IWorkbenchWindow window) {
         super(WorkbenchMessages.MaximizePartAction_text, window);
         setToolTipText(WorkbenchMessages.MaximizePartAction_toolTip);
         // @issue missing action id
 updateState();
         window.getWorkbench().getHelpSystem().setHelp(this,
                 IWorkbenchHelpContextIds.MAXIMIZE_PART_ACTION);
         setActionDefinitionId("org.eclipse.ui.window.maximizePart"); //$NON-NLS-1$
 }

     /* (non-Javadoc)
      * Method declared on PageEventAction.
      */
     public void pageActivated(IWorkbenchPage page) {
         super.pageActivated(page);
         updateState();
     }

     /* (non-Javadoc)
      * Method declared on PageEventAction.
      */
     public void pageClosed(IWorkbenchPage page) {
         super.pageClosed(page);
         updateState();
     }

     /* (non-Javadoc)
      * Method declared on IAction.
      */
     public void run() {
         if (getWorkbenchWindow() == null) {
             // action has been dispose
 return;
         }

         IWorkbenchPage page = getActivePage();
         if (page != null) {
             if (page instanceof WorkbenchPage) {
                 IWorkbenchPartReference partRef = page.getActivePartReference();

                 if (partRef != null) {
                     ((WorkbenchPage) page).toggleZoom(partRef);
                 }
             }
         }
     }

     /**
      * Updates the enabled state.
      */
     private void updateState() {
         setEnabled(getActivePage() != null);
     }
 }

